#!/usr/bin/python  
# tetris.py  
import sys  
import random  
from PyQt4 import QtCore, QtGui 
 
class Tetris(QtGui.QMainWindow):  
    def __init__(self):  
        QtGui.QMainWindow.__init__(self)  
        self.setGeometry(300, 300, 180, 380)  
        self.setWindowTitle('Tetris')
        
        self.tetrisboard = Board(self)  
        self.setCentralWidget(self.tetrisboard)  
        self.statusbar = self.statusBar()  
        self.connect(self.tetrisboard, QtCore.SIGNAL("messageToStatusbar(QString)"), self.statusbar, QtCore.SLOT("showMessage(QString)"))  
        
        self.tetrisboard.start()  
        
        self.center() 
         
    def center(self):  
        screen = QtGui.QDesktopWidget().screenGeometry()  
        size = self.geometry()  
        self.move((screen.width() - size.width()) / 2, (screen.height() - size.height()) / 2)  
        
class Board(QtGui.QFrame):
    BoardWidth = 10  
    BoardHeight = 22  
    Speed = 300  
    def __init__(self, parent):  
        QtGui.QFrame.__init__(self, parent)  
        self.timer = QtCore.QBasicTimer()  
        self.isWaitingAfterLine = False  
        
        self.curPiece = Shape()  
        self.nextPiece = Shape()  
        
        self.curX = 0  
        self.curY = 0  
        self.numLinesRemoved = 0  
        self.board = []  
        self.setFocusPolicy(QtCore.Qt.StrongFocus)  
        self.isStarted = False  
        self.isPaused = False  
        self.clearBoard()  
        
        self.nextPiece.setRandomShape() 
         
    def shapeAt(self, x, y):  
        return self.board[(y * Board.BoardWidth) + x]  
    def setShapeAt(self, x, y, shape):  
        self.board[(y * Board.BoardWidth) + x] = shape  
    def squareWidth(self):  
        return self.contentsRect().width() / Board.BoardWidth  
    def squareHeight(self):  
        return self.contentsRect().height() / Board.BoardHeight  
    
    def start(self):  
        if self.isPaused:  
            return  
        self.isStarted = True  
        self.isWaitingAfterLine = False  
        self.numLinesRemoved = 0  
        self.clearBoard()  
        self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), str(self.numLinesRemoved))  
        self.newPiece()  
        self.timer.start(Board.Speed, self)  
    def pause(self):  
        if not self.isStarted:  
            return  
        self.isPaused = not self.isPaused  
        if self.isPaused:  
            self.timer.stop()  
            self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), "paused")  
        else:  
            self.timer.start(Board.Speed, self)  
            self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), str(self.numLinesRemoved))  
        self.update()  
    def paintEvent(self, event):  
        painter = QtGui.QPainter(self)  
        rect = self.contentsRect()  
        boardTop = rect.bottom() - Board.BoardHeight * self.squareHeight()  
        for i in range(Board.BoardHeight):  
            for j in range(Board.BoardWidth):  
                shape = self.shapeAt(j, Board.BoardHeight - i - 1)  
                if shape != Tetrominoes.NoShape:  
                    self.drawSquare(painter, rect.left() + j * self.squareWidth(), boardTop + i * self.squareHeight(), shape)  
        if self.curPiece.shape() != Tetrominoes.NoShape:  
            for i in range(4):  
                x = self.curX + self.curPiece.x(i)  
                y = self.curY - self.curPiece.y(i)  
                self.drawSquare(painter, rect.left() + x * self.squareWidth(), boardTop + (Board.BoardHeight - y - 1) * self.squareHeight(), self.curPiece.shape())  
    def keyPressEvent(self, event):  
        if not self.isStarted or self.curPiece.shape() == Tetrominoes.NoShape:  
            QtGui.QWidget.keyPressEvent(self, event)  
            return  
        key = event.key()  
        if key == QtCore.Qt.Key_P:  
            self.pause()  
            return  
        if self.isPaused:  
            return  
        elif key == QtCore.Qt.Key_Left:  
            self.tryMove(self.curPiece, self.curX - 1, self.curY)  
        elif key == QtCore.Qt.Key_Right:  
            self.tryMove(self.curPiece, self.curX + 1, self.curY)  
        elif key == QtCore.Qt.Key_Down:  
            self.tryMove(self.curPiece.rotatedRight(), self.curX, self.curY)  
        elif key == QtCore.Qt.Key_Up:  
            self.tryMove(self.curPiece.rotatedLeft(), self.curX, self.curY)  
        elif key == QtCore.Qt.Key_Space:  
            self.dropDown()  
        elif key == QtCore.Qt.Key_D:  
            self.oneLineDown()  
        else:  
            QtGui.QWidget.keyPressEvent(self, event)  
    def timerEvent(self, event):  
        if event.timerId() == self.timer.timerId():  
            if self.isWaitingAfterLine:  
                self.isWaitingAfterLine = False  
                self.newPiece()  
            else:  
                self.oneLineDown()  
        else:  
            QtGui.QFrame.timerEvent(self, event)  
    def clearBoard(self):  
        for i in range(Board.BoardHeight * Board.BoardWidth):  
            self.board.append(Tetrominoes.NoShape)  
    def dropDown(self):  
        newY = self.curY  
        while newY > 0:  
            if not self.tryMove(self.curPiece, self.curX, newY - 1):  
                break  
            newY -= 1  
        self.pieceDropped()  
    def oneLineDown(self):  
        if not self.tryMove(self.curPiece, self.curX, self.curY - 1):  
            self.pieceDropped()  
    def pieceDropped(self):  
        for i in range(4):  
            x = self.curX + self.curPiece.x(i)  
            y = self.curY - self.curPiece.y(i)  
            self.setShapeAt(x, y, self.curPiece.shape())  
        self.removeFullLines()  
        if not self.isWaitingAfterLine:  
            self.newPiece()  
    def removeFullLines(self):  
        numFullLines = 0  
        rowsToRemove = []  
        for i in range(Board.BoardHeight):  
            n = 0  
            for j in range(Board.BoardWidth):  
                if not self.shapeAt(j, i) == Tetrominoes.NoShape:  
                    n = n + 1  
            if n == 10:  
                rowsToRemove.append(i)  
        rowsToRemove.reverse()  
        for m in rowsToRemove:  
            for k in range(m, Board.BoardHeight):  
                for l in range(Board.BoardWidth):  
                    self.setShapeAt(l, k, self.shapeAt(l, k + 1))  
        numFullLines = numFullLines + len(rowsToRemove)  
        if numFullLines > 0:  
            self.numLinesRemoved = self.numLinesRemoved + numFullLines  
            self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), str(self.numLinesRemoved))  
            self.isWaitingAfterLine = True  
            self.curPiece.setShape(Tetrominoes.NoShape)  
            self.update()  
    def newPiece(self):  
        self.curPiece = self.nextPiece  
        self.nextPiece.setRandomShape()  
        self.curX = Board.BoardWidth / 2 + 1  
        self.curY = Board.BoardHeight - 1 + self.curPiece.minY()  
        if not self.tryMove(self.curPiece, self.curX, self.curY):  
            self.curPiece.setShape(Tetrominoes.NoShape)  
            self.timer.stop()  
            self.isStarted = False  
            self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), "Game over")  
    def tryMove(self, newPiece, newX, newY):  
        for i in range(4):  
            x = newX + newPiece.x(i)  
            y = newY - newPiece.y(i)  
            if x < 0 or x >= Board.BoardWidth or y < 0 or y >= Board.BoardHeight:  
                return False  
            if self.shapeAt(x, y) != Tetrominoes.NoShape:  
                return False  
        self.curPiece = newPiece  
        self.curX = newX  
        self.curY = newY  
        self.update()  
        return True  
    def drawSquare(self, painter, x, y, shape):  
        colorTable = [0x000000, 0xCC6666, 0x66CC66, 0x6666CC, 0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00]  
        color = QtGui.QColor(colorTable[shape])  
        painter.fillRect(x + 1, y + 1, self.squareWidth() - 2, self.squareHeight() - 2, color)  
        painter.setPen(color.light())  
        painter.drawLine(x, y + self.squareHeight() - 1, x, y)  
        painter.drawLine(x, y, x + self.squareWidth() - 1, y)  
        painter.setPen(color.dark())  
        painter.drawLine(x + 1, y + self.squareHeight() - 1, x + self.squareWidth() - 1, y + self.squareHeight() - 1)  
        painter.drawLine(x + self.squareWidth() - 1, y + self.squareHeight() - 1, x + self.squareWidth() - 1, y + 1)
          
class Tetrominoes(object):  
    NoShape = 0  
    ZShape = 1  
    SShape = 2  
    LineShape = 3  
    TShape = 4  
    SquareShape = 5  
    LShape = 6  
    MirroredLShape = 7
      
class Shape(object):  
    coordsTable = (
        ((0, 0), (0, 0), (0, 0), (0, 0)),
        ((0, -1), (0, 0), (-1, 0), (-1, 1)),
        ((0, -1), (0, 0), (1, 0), (1, 1)),
        ((0, -1), (0, 0), (0, 1), (0, 2)),
        ((-1, 0), (0, 0), (1, 0), (0, 1)),
        ((0, 0), (1, 0), (0, 1), (1, 1)),
        ((-1, -1), (0, -1), (0, 0), (0, 1)),
        ((1, -1), (0, -1), (0, 0), (0, 1))  
    )  
    def __init__(self):  
        self.coords = [[0, 0] for i in range(4)]  
        self.pieceShape = Tetrominoes.NoShape  
        self.setShape(Tetrominoes.NoShape)  
    def shape(self):  
        return self.pieceShape  
    def setShape(self, shape):  
        table = Shape.coordsTable[shape]  
        for i in range(4):  
            for j in range(2):  
                self.coords[i][j] = table[i][j]  
        self.pieceShape = shape  
    def setRandomShape(self):  
        self.setShape(random.randint(1, 7))  
    def x(self, index):  
        return self.coords[index][0]  
    def y(self, index):  
        return self.coords[index][1]  
    def setX(self, index, x):  
        self.coords[index][0] = x  
    def setY(self, index, y):  
        self.coords[index][1] = y  
    def minX(self):  
        m = self.coords[0][0]  
        for i in range(4):  
            m = min(m, self.coords[i][0])  
        return m  
    def maxX(self):  
        m = self.coords[0][0]  
        for i in range(4):  
            m = max(m, self.coords[i][0])  
        return m  
    def minY(self):  
        m = self.coords[0][1]  
        for i in range(4):  
            m = min(m, self.coords[i][1])  
        return m  
    def maxY(self):  
        m = self.coords[0][1]  
        for i in range(4):  
            m = max(m, self.coords[i][1])  
        return m  
    def rotatedLeft(self):  
        if self.pieceShape == Tetrominoes.SquareShape:  
            return self  
        result = Shape()  
        result.pieceShape = self.pieceShape  
        for i in range(4):  
            result.setX(i, self.y(i))  
            result.setY(i, -self.x(i))  
        return result  
    def rotatedRight(self):  
        if self.pieceShape == Tetrominoes.SquareShape:  
            return self  
        result = Shape()  
        result.pieceShape = self.pieceShape  
        for i in range(4):  
            result.setX(i, -self.y(i))  
            result.setY(i, self.x(i))  
        return result
    
app = QtGui.QApplication(sys.argv)  
tetris = Tetris()  
tetris.show()  
sys.exit(app.exec_()) 
